Recent content by Gheret

I think I may have been overthinking this problem The sled is at rest so Ffr=mgcos So force required is (60/3.6)^2=2a(75) a=1.85ms^-2 F=22x1.85=40.7N Which is the answer in the book. :mad: Can't believe I worked on this problem for about an hour.

Homework Statement The co-efficient of kinetic friction for a 22kg bobsled on a track is 0.10. What force is required to push it down a 6 degree incline and achieve a speed of 60km/h at the end of 75m. Homework Equations Ffr=uFn v^2=2a(x) F=ma The Attempt at a Solution...

Thanks for clearing that up guys.

Quick question Doesn't F=mA imply that distance has no effect on force, but if I drop a 1kg ball from a height of 1m won't it have less force than the same ball from a height of say 5m? Or am I just confusing force with work? Thanks

You have been the best help. Thank you for not just telling me the answer cause now I have actually learned how to solve these for myself. :smile: Thank you!

Oh I was completely ignoring normal force! F=u(9.8m/s^-2)m mv^2/r=u(9.8m/s^-2)m (30)^2/70=u(9.8) Right?

I'm sorry but I am totally lost now.. What I have done so far: F(r)=mv^2/r=F(fr) F(r) being centripetal force and F(fr) being frictional force. But I do not know the equation for calculating coefficient of static friction. Thanks for helping me out.

I'm guessing that since mass will not change and the two forces have to be equal the m will cancel out but I still do not know how to calculate the acceleration into Newtons for this situation.

Homework Statement A car is traveling at 30m/s around a bend of radius 70m. What coefficient of static friction between the tires and the road is required to ensure the car will not slip? Homework Equations The Attempt at a Solution I know that the centripetal acceleration is...

Thanks for the reply. Would it be tan32=?/g With ? being the acceleration of the x component.

Homework Statement A train accelerates from rest causing the handles that hang from the roof to sway 32 degrees from vertical. How long will it take the train to travel 300metres. Homework Equations The Attempt at a Solution All I know is that the horizontal component of the force...